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NatWest's proposal as to what constitutes the world's best trade shows just how far the mad search for yield has gone.

The World's Best Risk/Reward Trade Is Long 10-Year Bund says NatWest.

It’s time to double down and add to long positions in 10-year German bunds, which offer the best risk-reward trade in the world, according to NatWest Markets Plc.

Fair value for 10-year German bond yields has halved to an estimated 0.06 percent, more than 20 basis points below current levels, according to strategists Andrew Roberts and Giles Gale. The reasons to buy remain plentiful, they wrote in a July 6 report.

Firstly, positioning: no-one is long and everyone is short. Secondly, the European Central Bank continues to support markets, offering long-term guidance as to the next policy steps. Thirdly, the amount of free float available in German securities will continue to shrink as the ECB’s asset-purchase program continues.

Dear NatWest

Let's assume as you must, there is absolutely no currency risk.

Let's also assume as you must, there is absolutely no chance the ECB does anything that surprises you.

Finally, let's assume that "no one is long" and that nothing can possibly be wrong with that thesis.

Assuming all of that, your gain to fair value is a bit "more than 20 basis points".

Heck. I will be generous and call it 25 basis points.

Is a quarter of a percent really the best you can do in terms of risk-reward?

By any chance did you up the ante with leverage?

If you are counting on capital gains to boost the return, then let me ask what happens if your currency risk assumption misses the mark?

The mad search for yield turns up strange proposals. This was another one.